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If you are interested in reading temps only, the wirelessMaverick ET-733 will do that, but be aware the probes have been a problem for some. They are RTD probes which are not the most reliable.
The Thermoworks TW-8060 uses industry standard Type K thermocouples which are very rugged but this unit does not have wireless capability.
The DigiQ also uses Type K probes but they have proprietary plugs. This unit also has a fan which will control air flow through the Egg and therefor allow temperature control. It is not wireless.
Pick your poison.